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50 lines
1.3 KiB
PHP
50 lines
1.3 KiB
PHP
; strlen function
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;
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; Copyright (c) 2003 Thomas Mathys
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; killer@vantage.ch
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;
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; This program is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program; if not, write to the Free Software
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; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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;
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%ifndef _STRLEN_INC
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%define _STRLEN_INC
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;********************************************************************
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; returns the length of an asciiz string
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; input : esi = pointer to string
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; output : eax = string length
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; destroys : nothing
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;********************************************************************
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strlen:
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push ecx
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push edi
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pushfd
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cld ; !
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mov ecx,-1
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mov edi,esi ; find terminating zero
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xor al,al
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repne scasb
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mov eax,edi ; calculate string length
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sub eax,esi
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dec eax
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popfd
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pop edi
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pop ecx
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ret
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%endif
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